I did exactly the same thing on my character, only after I had purchased did I see that it hadn't been necessary (this was on clicking the item and receiving the "you already have this" message) it was a pure mistake and if the game was coded properly it should not have even been possible to purchase something you have no use for. This has happened before for me when I purchased speeder at lvl 10 which I thought was over all chars but actually wasn't and my lvl 50 was way past it. Mind you in this case I did get a refund of the credits...

What is so different now with Cartel coins and WHEN are Bioware going to fix the problem of being able to buy stuff that's of no godly use??